Error message is difficult to read, unfortunately. And how are you copying and pasting the image to CMS? Could you provide the steps you took so we can reproduce the issue locally? And what version of CMS 7.5 is this?

The problem was that in the EPiServer backend we couldn't copy and past images. In CMS edit mode, the media section, when we copied an image (using the EPiServer interface) and pasted it in another folder the image itself was not copied (just the properties op the ImageType)

Stacktrace:

2014-10-13 14:49:35,185 [108] ERROR EPiServer.Core.Transfer.TransferLogger: 10.5.3 Export/import error: [Importing content 4108_8977] Exception: Could not find a part of the path '\\SERVER\Shared\Arlanet EpiServer\TerBergGroup\blobs\69212cf8b6da43f58277a4e8ccb3bb90\29ddaafe33c2445bb74ae14db887157e.jpg'.
System.IO.DirectoryNotFoundException: Could not find a part of the path '\\SERVER\Shared\Arlanet EpiServer\TerBergGroup\blobs\69212cf8b6da43f58277a4e8ccb3bb90\29ddaafe33c2445bb74ae14db887157e.jpg'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at EPiServer.Framework.Blobs.FileBlob.OpenRead()
at Chief2moro.ImageDataExtensions.ImageBlobUtility.GetDimensions(Blob imageBlob)
at Chief2moro.ImageDataExtensions.ImageResizeContentEvents.contentEvents_PublishingContent(Object sender, ContentEventArgs e)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at EPiServer.Core.PageStoreBase.RaiseCancellablePageEvent(String key, String defaultReason, ContentEventArgs eventArgs)
at EPiServer.DataFactory.Save(IContent content, SaveAction action, AccessLevel access)
at EPiServer.Core.Transfer.ContentTransfer.Save(IContent content, Dictionary`2 propertyStringLookup, AccessLevel requiredDestinationAccess, Boolean newpage)
at EPiServer.Core.Transfer.ContentTransfer.Import(RawContent rawContent, AccessLevel requiredDestinationAccess, Guid& importedPageGuid)
at EPiServer.Core.Transfer.ContentTransfer.Import(ITransferContentData content, AccessLevel requiredDestinationAccess)
at EPiServer.Enterprise.DataImporter.ImportContents[T](XmlTextReader reader, ZipPackage package)
at EPiServer.Enterprise.DataImporter.ImportStream(ZipPackage package, XmlTextReader reader)
at EPiServer.Enterprise.DataImporter.ImportRaw(ZipPackage package)
at EPiServer.Enterprise.DataImporter.Import()
2014-10-13 14:49:35,210 [108] ERROR EPiServer.Enterprise.Transfer.ContentCopyHandler: Failed to copy pages with root '4106' to '3528'

After some investigation we found that removing a nuget package called chief2moro.ImageDataExtensions (version 1.0.1) solved the problem. The EpiServer.Core version is 7.5.1003.0.